QT49-3.6864MAAJ-B

Overview

The QT49-3.6864MAAJ-B is a through-hole quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 3.6864 MHz. It utilizes the HC-49 package style and features a load capacitance of 18 pF. The component exhibits a frequency tolerance of ±30 ppm at 25°C and maintains stability within ±30 ppm across an operating temperature range of -20°C to +70°C. The series resistance is typically specified at 150 ohms, ensuring reliable oscillation in standard circuit configurations.

Feature Summary

• Provides stable frequency generation for digital clocking applications
• Designed for through-hole mounting on printed circuit boards
• Offers consistent performance across defined industrial temperature ranges

Applications

• Microcontroller clock sources
• Digital communication interfaces
• Timing circuits for consumer electronics

Procurement Notes

Verify the specific suffix 'MAAJ-B' against official QST documentation to confirm the 18 pF load capacitance and ±30 ppm tolerance specifications. Ensure the HC-49 form factor matches the target PCB footprint requirements. Cross-reference the manufacturer designation with authorized distributors to guarantee authenticity and traceability of the component batch.

Selection Notes

Select this component when a precise 3.6864 MHz reference is required for through-hole assembly. The 18 pF load capacitance must align with the oscillator circuit design parameters. Consider the ±30 ppm tolerance sufficient for general timing applications where higher precision is not critical. Evaluate thermal stability requirements against the -20°C to +70°C operational range.

Part Context

This part belongs to the QT49 series of quartz crystals, characterized by hermetically sealed metal cans. The series supports various frequencies and tolerances, serving as a foundational timing element for embedded systems. The HC-49 package provides mechanical robustness suitable for environments requiring durable through-hole connections.

Replacement Considerations

Compatible substitutes include other HC-49 crystals with identical 3.6864 MHz frequency, 18 pF load capacitance, and ±30 ppm tolerance. Verify that alternative manufacturers specify equivalent series resistance and drive level limits to ensure circuit compatibility without modification.